I to would get that tank replaced judging by the photo. I bought a replacement EVO1 tank a while ago and it's right arse to screw the cap on and off. Though the thread looks ok on mine.
Also thought...

The bike has done 12K miles, 5K of which are mine and it's not need any oil added other than a change for the 12K service, the level hadn't dropped below minimum when checking, though it does have a...